Silicone Oil 350 cSt – Polydimethylsiloxane for Moulds & Industrial Lubrication
Silicone Oil 350 cSt – Polydimethylsiloxane for Moulds & Industrial Lubrication
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Chemically inert food grade (PC) silicone oil for moulds, lubrication and defoaming
Silicone Oil 350 cSt is a medium viscosity, colourless and chemically inert polydimethylsiloxane (PDMS) fluid with a viscosity of 350 cSt and a density of 0.970 g/cm³ at 25 °C. With a flash point above 300 °C, a pour point of -50 °C and a surface tension of 21.1 mN/m, this oil offers a good balance between fluidity, film retention and stability. The 350 cSt grade is the most widely used grade for softening silicones: fluid enough to mix evenly, viscous enough for a lasting film.
This oil is supplied in PC grade (food grade) from AToro. According to the manufacturer's declaration of compliance, this grade complies with EC 1935/2004, FDA 21 CFR 173.340 and FDA 21 CFR 177.2600, among others. See the Compliance section below for the full list.
Key benefits
- ✓ Flash point above 300 °C: a high flash point makes the oil safe to handle and store. For the maximum service temperature, observe the note on thermal stability below.
- ✓ Viscosity 350 cSt at 25 °C: the most widely used grade as a silicone additive, with a good balance between mixability and lasting film retention on moulds and surfaces.
- ✓ Pour point -50 °C: stays fluid at low temperatures, suitable for applications in cold environments.
- ✓ Surface tension 21.1 mN/m: wets surfaces very well and spreads evenly as a release film on moulds and dies.
- ✓ Food grade (PC) according to the declaration of the manufacturer: suitable as a defoamer (FDA 21 CFR 173.340) and in food contact applications, within the conditions of the regulations listed.
- ✓ Chemically non reactive: does not react with addition or condensation silicones, most plastics and elastomers, so it is safe as an additive without unwanted side reactions.
Typical applications
- → Release agent for rubber, polyurethane, epoxy and metal die casting, leaving a lasting release film on complex mould surfaces
- → Additive for addition and condensation silicones (1 to 10%) to lower hardness and increase flowability
- → Defoamer in non aqueous systems, effective in small amounts
- → Lubricant for plastic and elastomer surfaces, without attacking the material
- → Electrically insulating fluid and damping fluid in electrical and electronic equipment
- → Smoothing spatula applied silicone moulds by hand, the 350 cSt viscosity spreads easily by hand or brush
Processing as an additive in silicones
- Weigh the required amount of component A of your silicone and add component B according to the specified mixing ratio.
- Stir the mixture thoroughly.
- Add the silicone oil to the silicone mixture and stir again. Use 1 to 10% oil based on the total weight. Adding about 8% lowers the Shore A hardness by roughly 3 to 5 points.
- Stay below 10%: more oil can reduce the final strength of the cured silicone to an unacceptable level.
- Process the mixture within the pot life of your silicone.
Compliance
According to the declaration of compliance of AToro B.V. (23 April 2024) for Silicone Fluid DM PC, the 350 cSt PC grade complies with:
- → EC 1935/2004 and EU 10/2011 for materials and articles intended to come into contact with food
- → BfR Recommendation XV Silicones
- → French Arrêté of 25 November 1992 for materials in contact with food
- → FDA 21 CFR 173.340, defoaming agent as a secondary direct food additive
- → FDA 21 CFR 177.2600, rubber articles intended for repeated use
- → FDA 21 CFR 175.300, 176.210, 175.105, 176.170, 178.3120 and 177.1210, use in the manufacture of food packaging up to 10 ppm, subject to limits on extractables
- → Listed under E 900 polydimethylsiloxane
This is a declaration by the manufacturer, not a certificate. National regulations in the country of use continue to apply. For food contact, you as the user are responsible for the compliance of your finished product. The declaration of compliance is available on request.
Professional support
Not sure which viscosity suits your application, or do you have questions about using silicone oil in food contact? Contact us at info@siliconesandmore.com for technical data sheets, the declaration of compliance or product advice.
Product Properties
- ColorTransparentColor of the finished product
- TransparencyTransparentDegree of transparency
- Viscosity350mPa·sViscosity of the uncured silicone
- Density0.97g/cm³Density of the cured material
Physical Properties
- Flash point300°CMin. temperature at which the product ignites
- Surface tension0.0211N/mSurface tension at 25°C
- Refractive index1.403Refractive index at 25°C
Thermal Properties
- Cold flexibility-50Remains flexible at low temperatures
Electrical Properties
- Electrically insulatingYesPrevents electric current flow
Certification & Safety
- Food-gradeYesSuitable for food contact
- FDA certifiedYesMeets FDA standards (21 CFR)
- Chemical resistanceResistant to water and weak acids; not resistant to strong acids, bases, and oxidizing agentsResistance to chemicals
- Moisture resistantYesResistant to moisture and water absorption
Application
- Use caseRelease agent, lubricant, anti-foaming agent and additive to make silicones softer and more fluidIntended use
- Silicone type["Silicone oil","Auxiliary material"]Type of silicone or polymer
Safety Information
Silicone Oil 350 cSt is classified as harmful to aquatic life with long lasting effects (H412, Aquatic Chronic 3) in accordance with Regulation (EC) No 1272/2008. No hazard pictograms or signal words are required. Under normal use, the product does not pose an acute health hazard. Prevent the product from being released into the environment, reaching drains or surface water. Recommended personal protective equipment: safety glasses with side shields (EN 166) in case of risk of splashes. Specific requirements for skin and hand protection are not required, but good work hygiene is recommended. At elevated temperatures above 150°C: ensure adequate ventilation or extraction. Consult the full Safety Data Sheet (SDS) for detailed information on storage, disposal, first aid measures and environmental precautions. The SDS is available via the download button on this page.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
Required protection (ISO 7010)
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| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H412 | Harmful to aquatic life with long lasting effects | P273 P501 |
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Technical data sheets
Frequently asked questions
What is the delivery time for my order?
Orders placed and paid on working days are in most cases shipped the same day. Weekend orders are processed on the next working day.
Indicative delivery times: Netherlands usually within 1 working day, Belgium and Germany typically 1–2 working days, other countries depending on destination and carrier. These are guidelines, not guarantees: peak periods, public holidays or carrier delays can have an effect.
What is the return policy?
You have 30 days to return after receipt. Email info@siliconesandmore.com within 30 days of delivery with your name and order number. The full conditions are in our return policy.
How can I track my order?
As soon as your order has shipped, you'll receive a track & trace code by email. It can take up to 24 hours before the code is active.
I have a problem with my order – how do I reach you?
Contact us via our contact page or email info@siliconesandmore.com. We're happy to help you quickly.
Can I order as a business?
Yes. Apply for a business account; we review your application within 3 working days. After that you order while logged in and pay on invoice, with payment terms of 14 days after delivery.
EU businesses outside the Netherlands with a valid VAT number order with VAT reverse-charged (0%, intra-community supply). The VAT number is stored in your business account; it cannot be added to an order after it has been placed.